Glasses capable of continuously zooming

Abstract

A pair of continuous zoom glasses comprises a machine body (1), glasses legs (2) and nose pads (3), the glasses legs (2) are connected with the machine body (1), and a transmission mechanism, a control module and a guide device and / or an auxiliary guide device for limiting lens movement are arranged in the machine body (1). A distance sensor (6) is arranged on the front side of the machine body (1), a wearing sensor (7) and a three-axis acceleration sensor are further arranged in the machine body (1), the distance sensor (6), the wearing sensor (7) and the three-axis acceleration sensor are all electrically connected with a control module, and the control module is electrically connected with a driving part, so that the use state of the continuous zoom glasses is monitored in real time, and the transmission mechanism is controlled. According to the glasses capable of continuously zooming, the lenses are high in stability and movement precision in the movement process, the movement precision is high, the use is more comfortable, and visual training of visual function decline caused by adjusting factors is facilitated.

Description

Continuous zoom glasses Technical Field

[0001] The present invention relates to the technical field of glasses, and in particular to a pair of glasses capable of continuously changing focus. Background Art

[0002] Currently, myopia is becoming increasingly prevalent, especially among teenagers. The primary cause of myopia is excessive nearsightedness. Changing unhealthy eye habits, alleviating visual fatigue, and restoring the eye's self-regulating function are currently effective methods for improving myopia. Furthermore, vision training through auxiliary equipment is also an effective means of rapidly correcting pseudomyopia. Consequently, the availability of devices for improving vision has increased significantly in recent years.

[0003] Vision training devices are ophthalmic technology products centered around "intelligent zoom vision training," supported by the internet, the Internet of Things, and big data services, and based on dynamic eye accommodation training and visual perception training. These products are designed to effectively prevent and control myopia through scientifically sound accommodation training and dynamic visual perception training.

[0004] In the "Intelligent Zoom Vision Training" system, each lens group corresponds to a lens for the left and right eyes. Each lens group consists of two overlapping zoom lenses that can move relative to each other, either up and down or left and right. Each zoom lens has two freeform surfaces on both sides, while some lenses have both a flat surface and a freeform surface on both sides.

[0005] The intelligent zoom function incorporates a free-form linear zoom lens assembly and a digital control system. The free-form linear zoom lens assembly consists of two conjoined left and right lenses. Each conjoined lens has a free-form surface designed with the same geometric function for the left and right eyes. The two conjoined left and right lenses form a lens assembly. During the horizontal movement of the lens assembly, the central overlapping area achieves device-measurable linear zoom performance. The digital control system, which combines a single-chip microcomputer, a network communication module, an app interaction module, and a mechanical transmission mechanism, enables the digital mechanical traditional system to move horizontally according to the requirements of the set program. Movement parameters include step length, speed, round-trip cycle, and a focus switching system during the progressive operation. All operation data and movement trajectories can be uploaded to a cloud database through the app interaction system, forming a corresponding feedback mechanism to enable timely adjustment of the operating state to match the user's current visual ability.

[0006] The free-form surface of a variable focus lens consists of point P, area C, point N, and area A. Point P is the optical center point corresponding to the maximum positive power, i.e., the position corresponding to the highest point of the free-form surface; point N is the optical center point corresponding to the maximum negative power, i.e., the position corresponding to the lowest point of the free-form surface. Area C is the continuous zoom channel, the transition area from the maximum positive power at point P to the maximum negative power at point N, i.e., the transition area between the highest and lowest points. Area A is the peripheral aberration area, i.e., the area outside the highest and lowest points of the lens, and the transition area between the highest and lowest points.

[0007] A Chinese patent (2015202467920 A lens group with arbitrary zoom) provides a lens group, wherein one surface of each lens is a horizontal plane, and the other surface of the lens is a non-horizontal curved surface with ups and downs that conforms to a mathematical law of change; each of the non-horizontal curved surfaces of the lens is provided with a highest point and a lowest point; a plurality of continuously changing optical centers are uniformly distributed between the highest point and the lowest point of the non-horizontal curved surface of the lens and along the non-horizontal curved surface of the lens; the refractive powers of the plurality of optical centers decrease or increase in sequence.

[0008] Chinese patent (2018104826466) discloses a mirror-designed double-sided zoom lens assembly device and assembly method. The device includes two sets of double-sided zoom lenses, each set of which includes two double-sided zoom lenses, each of which includes two symmetrical, mirror-designed zoom curved surfaces. The assembly method combines the two sets of double-sided zoom lenses and drives them using a motor.

[0009] Chinese patent (2021100687112 A zoom drive device for smart glasses and smart glasses) discloses a zoom drive device for smart glasses and smart glasses, including a transmission box body, a transmission module and a lens mounting assembly; the transmission module is installed in a transmission connection with the lens mounting assembly and is installed together in the transmission box body; the lens mounting assembly includes a slide and a lens mounting platform, the slide is installed on the screw drive assembly, and the lens mounting platform is detachably arranged on the bottom slide groove of the transmission box body and can slide along the slide groove direction; the bottom of the slide is connected to the top of the lens mounting platform by a clip, and the transmission module drives the slide and then drives the lens mounting platform to slide, thereby changing the overlap degree of the front and rear groups of lenses installed on the lens mounting platform to achieve the zoom of the glasses.

[0010] Existing varifocal glasses have the following aspects that can be improved:

[0011] 1. Although existing varifocal glasses can achieve zooming, the lenses are generally multifocal and cannot zoom continuously. During the cross movement of the front and rear lenses, image jumping occurs at the edge of a certain focal point. When the refractive power of the lens varies in different areas, the human eye cannot tolerate it, resulting in large optical aberrations such as distortion and field curvature.

[0012] 2. Existing varifocal glasses usually require manual control of the transmission mechanism, and the degree of automation is not high. The transmission stability and transmission accuracy of the motor-driven transmission mechanism cannot meet the requirements of precision transmission, thus affecting the stability and movement accuracy of the lens during movement, and affecting visual recovery training.

[0013] 3. When users look at distant and close scenes, they need different degrees of vision. Existing zoom glasses cannot adjust the range of the degree of smart zoom glasses according to the distance between the target and the user's eyes, resulting in poor training results. Therefore, it needs to be improved.

[0014] Summary of the Invention

[0015] The technical problem to be solved by the present invention is that the lenses of existing zoom glasses cannot focus continuously, and the transmission stability and transmission accuracy of the transmission mechanism cannot meet the requirements of precision transmission, which affects the stability and movement accuracy of the lenses during movement and affects visual recovery training.

[0016] In order to solve the above technical problems, the present invention provides a pair of glasses with continuous zoom, in which the lenses are continuous zoom lenses, the slider has high stability and movement accuracy during movement, the two lenses have good stability and high movement accuracy when moving, are more comfortable to use, and are conducive to visual recovery training.

[0017] The technical solution adopted by the present invention to solve the above technical problems is: a pair of continuously variable focus glasses, including a body, a transmission mechanism, a control module, left and right temples and a nose pad, wherein the left and right temples are both connected to the body;

[0018] The body is provided with a control module, a distance sensor is provided on the front side of the body, and a wearing sensor and a three-axis acceleration sensor are also provided in the body. The distance sensor, the wearing sensor and the three-axis acceleration sensor are all electrically connected to the control module, and the control module is electrically connected to the driving member to monitor the use status of the continuous zoom glasses in real time and control the transmission mechanism;

[0019] A circuit board is mounted on the machine body, and two limit switches are provided on the circuit board. The two limit switches are respectively located at the front and rear extreme positions of the movement of one of the sliders, and the two limit switches are electrically connected to the control module;

[0020] At least one lens group is mounted on the housing, each lens group comprising two overlapping and cross-movable front and rear lenses, each of which is a single-sided free-form surface continuous zoom lens, with one side of each lens being a flat surface and the other side being a free-form surface; the free-form surface continuous zoom lens is generated using an inner B-spline surface fitting mathematical model, and the surface refractive power of the lens' continuous zoom channel changes continuously;

[0021] The control module drives the front lens and the rear lens of the lens group to move crosswise at the same speed and in opposite directions through the transmission mechanism to achieve zooming;

[0022] The body is provided with an installation cavity, the installation cavity is provided with a transmission mechanism, and the two lenses are both transmission-connected to the transmission mechanism;

[0023] A shell for installing a transmission mechanism is provided in the body, and the shell includes an upper shell and a lower shell, and an installation cavity is formed inside the upper shell and the lower shell. A transmission mechanism is provided in the installation cavity, and the two lenses are connected to the transmission mechanism; the transmission mechanism includes a driving member and a transmission member, and the transmission member includes two screw rods, and the driving member and the transmission member are transmitted through gear meshing; the two screw rods are provided with a slider threadedly connected thereto, and the slider includes a slider body and a lens mounting seat, and the two lenses are respectively connected to the two lens mounting seats.

[0024] The continuously variable focus glasses of the present invention have two lead screws and a driving member connected by gears, which have high transmission accuracy and good stability of the slider movement. In the process of the slider moving and driving the two lenses to move, the stability and movement accuracy of the lenses are also higher. Therefore, when using the glasses, the comfort is higher, which is conducive to vision recovery training.

[0025] Furthermore, the threads of the two screw rods rotate in opposite directions, so that the two sliders move in opposite directions at the same speed under the driving action of the driving member, driving the front lens and the rear lens to move in opposite directions at the same speed.

[0026] Furthermore, a guide device and / or auxiliary guide device for limiting the movement of the lens is provided in the installation cavity. The guide device and / or auxiliary guide device are arranged parallel to the screw rod, and the guide device and / or auxiliary guide device are slidably connected to the two sliders.

[0027] Furthermore, the guide device includes two guide shafts arranged parallel to the screw rod, and the two guide shafts are slidingly connected to the two screw rods respectively.

[0028] Furthermore, the auxiliary guide device includes two guide bars arranged parallel to the screw rod, and the slider is provided with a sliding groove that matches the guide bars, and the slider is slidably matched with the guide bars.

[0029] In some embodiments, no guide shaft is provided in the guide device, and a guide plate is provided on the side of the lower shell. The guide device includes sliding blocks provided on the two side surfaces of the slider body and a guide plate on the side of the lower shell. The screw rod is parallel to the guide plate. The position of the guide plate corresponds to the sliding block. The sliding block is tightly attached to the adjacent guide plate and can slide in the axial direction of the screw rod to guide the slider.

[0030] Furthermore, in some embodiments, slots are provided on both the left and right sides of the slider body, and the sliding block includes a connector, which is formed as an elastic plate, and a boss is fixed on one surface of the connector close to the guide plate. The connector is inserted into the slot, and the boss is tightly attached to the adjacent guide plate and can slide in the axial direction of the screw rod.

[0031] Furthermore, in some embodiments, roller mounting cavities are provided on both the left and right sides of the slider body, the sliding block is a roller, and the roller is installed in the roller mounting cavity of the slider body. The roller is rotatably connected to the slider body in the roller mounting cavity, and the rolling surface of the roller is tightly attached to the adjacent guide plate and can roll in the axial direction of the screw rod.

[0032] Furthermore, the slider is connected to the lens via two magnetic parts.

[0033] Furthermore, a magnet is fixedly connected to the lens, another magnet is installed on the slider, and an assembly groove for assembling magnetic material is provided on the slider of the lens mounting seat, and the lens mounting seat is connected to the lens through magnetic attraction.

[0034] Furthermore, a control module is provided in the body, a distance sensor is provided on the front side of the body, a wearing sensor is provided on the rear side of the body, and a three-axis acceleration sensor is also provided in the body. The distance sensor, the wearing sensor and the three-axis acceleration sensor are all electrically connected to the control module, and the control module is electrically connected to the driving component to monitor the usage status of the continuous zoom glasses and control the transmission mechanism.

[0035] Furthermore, a circuit board is installed on the machine body, and two limit switches are provided on the circuit board. The two limit switches are respectively located at the front and rear extreme positions of the movement of one of the sliders, and the two limit switches are electrically connected to the control module.

[0036] Furthermore, the lens set includes two front and rear conjoined lenses for left and right eyes, and the left and right eyes of each conjoined lens have free-form surfaces designed with the same geometric function.

[0037] Furthermore, the front lens and the rear lens are both single-sided zoom lenses, and one side of each lens is a flat surface and the other side is a free-form surface.

[0038] The continuously variable focus glasses of the present invention have the following beneficial effects:

[0039] 1. Since the lenses of these continuously zoom glasses are all single-sided free-form continuous zoom lenses, when the lenses move to any fixed position, all the refractive powers of the lenses from the optical center point to the zoom channel are equal in the horizontal and vertical directions. There is no refractive power change or image jump in the pupil area, and the vertical refractive power is zero.

[0040] 2. Through the cooperation of the control module, wearing sensor, distance sensor and three-axis acceleration sensor, the control module can control the transmission mechanism to automatically adjust the position of the front lens and the rear lens, making it more convenient to use; at the same time, the use status of the continuous zoom glasses is monitored in real time, and the operation mode of the transmission mechanism can be automatically adjusted and controlled to enhance the effect of visual training.

[0041] 3. The driving part and the two screw rods are driven by gears. When installing, you only need to mesh the driving gear and the driven gear. The transmission stability and transmission accuracy are high, and it is easy to install and disassemble, which is beneficial to the maintenance of the equipment and the replacement of parts, saving installation and disassembly time. It has a simple structure and low cost.

[0042] 4. Two limit switches are set on the circuit board. The initial positions of the two sliders are located in the middle of the two screw rods respectively. The two sliders move simultaneously in opposite directions. When the sliders move to the extreme positions, that is, the two limit switches, the control module stops moving or controls the driving part to drive in the opposite direction. Compared with the limit of some mechanical structures, the limit accuracy is high, the limit stability is good, and the cost is low.

[0043] 5. The lens and the slider are connected by magnetic attraction, which is easy to connect and detachable, making it convenient for equipment assembly, maintenance and replacement.

[0044] 6. The slider is guided simultaneously on the upper and lower sides of the screw by the guide shaft and the guide bar, which improves the stability and movement accuracy of the slider, avoids the slider from shaking slightly in the body, further improves the stability of the slider movement, thereby further improving the stability of the lens movement and improving the user's comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The present invention will be further described below with reference to the accompanying drawings and examples.

[0046] FIG1 is a schematic diagram of the overall structure of the continuously variable focus glasses of the present invention.

[0047] FIG2 is a schematic structural diagram of the body and lens mounting seat of the continuously variable focus glasses of the present invention.

[0048] FIG3 is a schematic structural diagram of the transmission mechanism of the present invention.

[0049] FIG4 is a schematic diagram of the assembly of the transmission mechanism of the present invention.

[0050] FIG5 is a schematic structural diagram of the front lens and the rear lens of the present invention.

[0051] FIG6 is a diagram showing the distribution of lens regions according to the present invention.

[0052] FIG7 is a schematic structural diagram of a slider assembly according to embodiment 2 of the present invention.

[0053] FIG8 is a side view of a slider assembly according to embodiment 2 of the present invention.

[0054] FIG9 is a schematic structural diagram of the lower shell in Example 2 of the present invention.

[0055] FIG10 is a schematic structural diagram of the slider body in Example 3 of the present invention.

[0056] FIG11 is an enlarged view of point A in FIG8 .

[0057] FIG12 is a schematic structural diagram of the slider body in Example 4 of the present invention.

[0058] In the figure: 1. body; 2. temples; 3. nose pads; 4. front lens; 5. rear lens; 6. distance sensor; 7. wearing sensor; 8. upper shell; 9. lower shell; 10. motor; 11. first screw rod; 12. second screw rod; 13. first slider; 14. second slider; 15. first gear; 16. second gear; 17. third gear; 18. circuit board; 19. limit switch; 20. first magnet; 21. second magnet; 22. third magnet; 23. Four magnets; 24. First guide shaft; 25. First guide strip; 26. Second guide shaft; 27. Second guide strip; 28. First guide groove; 29. ​​Second guide groove; 30. Sliding block; 301. Connector; 302. Boss; 31. Left side panel; 32. Right side panel; 33. Middle side panel; 34. Guide plate; 35. Slider body; 36. Lens mounting seat; 37. Slot; 371. Groove; 372. Avoidance surface; 38. Roller mounting cavity; 39. Roller. DETAILED DESCRIPTION

[0059] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0060] In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," and "outside" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In the description of the present invention, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can mean fixed, removable, or integral; mechanical or electrical; direct or indirect through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention.

[0061] (Example 1)

[0062] As shown in Figures 1 to 6, the preferred embodiment of the present invention is a pair of continuously variable focus glasses comprising a body 1, left and right temples 2, and a nose pad 3. The nose pad 3 is removably mounted on the side of the body 1 closest to the human body and in the middle of the body 1. The left and right temples 2 are elastically hinged to the sides of the body 1. A lens assembly is also mounted on the body 1. The lens assembly comprises two conjoined lenses for left and right eyes, each of which can be free-form surfaces designed using the same geometric function, such as a Zernike polynomial. The two conjoined lenses for left and right eyes are respectively a front lens 4 and a rear lens 5. The front lens 4 and rear lens 5 are arranged in a front-to-back arrangement with partial overlapping areas and can move horizontally and crosswise. During this horizontal crosswise movement, the lens assembly achieves device-measurable linear zoom performance in the central overlapping area.

[0063] Each lens is a single-sided free-form surface continuous zoom lens. One side of each lens is a flat surface and the other side is a free-form surface. As shown in Figure 6, a continuous zoom channel is provided on the free-form surface side, and the periphery of the continuous zoom channel is a peripheral aberration zone. The free-form surface in this embodiment is based on the distribution of refractive power at each point of the single-sided free-form surface lens, and a mathematical model is fitted to the surface of the entire curved surface lens. The surface refractive power of the lens' continuous zoom channel changes continuously, which is suitable for fitting using B-spline functions and radial basis functions. Since the B-spline function fitting curve is infinitely differentiable within all nodes, the mathematical expression for the B-spline curve describing the single-sided free-form surface lens in this embodiment is:

[0064] N i，k (u), N j，k (v) is the weight function in the x and y directions in the B-spline surface fitting mathematical model, d i，j is the control point of the free surface. m and n represent the number of control points. The intervals of u and v are determined by i and j (i≤u<i+k, j≤v<j+k). i，k (u), N j，k In (v), i and j represent the order of the function, and k represents the order of the function (k≠1). i，k The order of the function is k, which means that each segment of the function has a k-1 degree polynomial. The B-spline fringe function can be regarded as a series of control points d i，j and weight function N i，k (u), N i，k (v) is a linear combination of. In short, each control point is multiplied by its corresponding weight function and then summed. The weight function is pre-designed and only related to the order k. This function does not change with the number of control points. What can be controlled is the control point d i，j The number of, that is, m and n.

[0065] The above B-spline surface fitting mathematical model is used to simulate the free-form surface model with the set diopter change. Through mold casting and CNC cutting, a single-sided free-form surface continuous focus lens is produced.

[0066] In this embodiment, except for the free-form surface linear zoom that jumps 0.25D (±0.25D) at the zero point position (due to the B-style fringe function characteristics), that is, it is not differentiable at the zero refractive power point position, resulting in a refractive power jump phenomenon, all other central areas are differentiable, that is, linear zoom.

[0067] A mounting cavity is provided in the body 1, and a transmission mechanism is provided in the mounting cavity. The front lens 4 and the rear lens 5 are both connected to the transmission mechanism. The driving member includes a motor 10. Driven by the motor 10, the transmission mechanism drives the front lens 4 and the rear lens 5 to move left and right. The movement directions of the front lens 4 and the rear lens 5 are opposite. The front lens 4 and the rear lens 5 are both single-sided zoom lenses. Specifically, the two surfaces that are close to each other are flat surfaces, and the two surfaces that are opposite to each other are free-form surfaces.

[0068] A shell for installing a transmission mechanism is provided in the body 1, and the shell includes an upper shell 8 and a lower shell 9. A cavity is formed inside the upper shell 8 and the lower shell 9. The transmission mechanism includes a motor 10 and a transmission member installed in the cavity. A driving gear is provided on the output shaft of the motor 10, and the driving gear is a first gear 15. The transmission member includes two screw rods, and a driven gear is coaxially connected to the two screw rods. The driven gear is engaged with the driving gear. A slider is provided on each of the two screw rods. The slider includes a slider body 35 and a lens mounting seat 36. The lens mounting seat 36 is fixedly connected to the bottom of the slider body 35, and the two lenses are respectively connected to the two lens mounting seats 36.

[0069] The two screw rods are a first screw rod 11 and a second screw rod 12. The driven gear at one end of the first screw rod 11 is a second gear 16. The second gear 16 is coaxially fixedly connected to the first screw rod 11. The first gear 15 is meshed with the second gear 16 to realize the transmission connection between the motor 10 and the first screw rod 11. The driven gear at one end of the second screw rod 12 is a third gear 17. The third gear 17 is coaxially fixedly connected to the second screw rod 12. The third gear 17 is meshed with the first gear 15. A first slider 13 is provided on the first screw rod 11. The first screw rod 11 passes through the first slider 13 and is threadedly connected to the first slider 13. The first slider 13 is connected to the front lens 4. A second slider 14 is provided on the second screw rod 12. The second screw rod 12 passes through the second slider 14 and is threadedly connected to the second slider 14. The second slider 14 is connected to the rear lens 5. The rotation directions of the first screw rod 11 and the second screw rod 12 are opposite. When the motor 10 drives the first screw rod 11 and the second screw rod 12 to rotate, the moving directions of the first slider 13 and the second slider 14 are opposite.

[0070] A circuit board 18 is mounted on the lower shell 9 , and two limit switches 19 are provided on the circuit board 18 . The two limit switches 19 are respectively located at the front and rear extreme positions of the first slider 13 . Both limit switches 19 are electrically connected to the control module, and the control module is electrically connected to the motor 10 .

[0071] The slider and the lens are connected via two magnetic components. A first magnet 20 is provided on the first slider 13, and a first mounting slot is provided on the first slider 13 for mounting the first magnet 20. The shape of the first magnet 20 matches the first mounting slot. Specifically, the first magnet 20 and the first mounting slot are dovetail-shaped, facilitating assembly and preventing the first magnet 20 from falling out of the first mounting slot. A second magnet 21 is provided on the front lens 4. The first magnet 20 and the second magnet 21 are magnetically attracted to each other to connect the first slider 13 to the front lens 4. A third magnet 22 is provided on the second slider 14, and a second mounting slot is provided on the second slider 14. The shape of the third magnet 22 matches the second mounting slot. A fourth magnet 23 is provided on the rear lens 5. The third magnet 22 and the fourth magnet 23 are magnetically attracted to each other to connect the second slider 14 to the rear lens 5.

[0072] A guide device and an auxiliary guide device for limiting the movement of the lens are also provided in the mounting cavity. The guide device and the auxiliary guide device are respectively arranged on both sides of the screw rod. The guide device includes two guide shafts, namely a first guide shaft 24 and a second guide shaft 26; the first guide shaft 24 is arranged below the first screw rod 11, and the first guide shaft 24 passes through the through hole of the first slider 13 and is slidably connected to the first slider 13; the second guide shaft 26 is located below the second screw rod 12, and the second guide shaft 26 passes through the through hole of the second slider 14 and is slidably connected to the second slider 14; the auxiliary guide device includes two guide bars, They are respectively the first guide bar 25 and the second guide bar 27; the first guide bar 25 is located above the first screw rod 11, and the first slider 13 slides in cooperation with the first guide bar 25; the second guide bar 27 is located above the second screw rod 12, and the second slider 14 slides in cooperation with the second guide bar 27; the upper shell 8 is provided with three strip holes, and the first guide bar 25 and the second guide bar 27 are formed between the three strip holes, the first slider 13 is provided with a first guide groove 28 that slides in cooperation with the first guide bar 25, and the second slider 14 is provided with a second guide groove 29 that slides in cooperation with the second guide bar 27.

[0073] A control module is provided in the body 1, a distance sensor 6 is provided on the front side of the body 1, and a wearing sensor 7 is provided on the rear side of the body 1. The distance sensor 6 and the wearing sensor 7 are both electrically connected to the control module, and the control module is electrically connected to the transmission mechanism to control the transmission mechanism.

[0074] In this embodiment, the zoom range of the lens group is: +5.00D (±0.25D) to -18.00D (±0.25D); zoom mode: the front lens and the rear lens move horizontally in opposite directions relative to each other, and the overlapping area of ​​the lens group is linearly zoomed; the front and rear lens spacing: the adjacent surfaces of the front and rear lenses are flat, with a spacing of 0.2mm (±0.05mm); the flatness of the flat sides of the front and rear lenses is: less than or equal to 0.1mm (±0.05); the front and rear lens displacement: the front and rear lens center lines move 11.5mm unilaterally, that is, after the front and rear lenses are centered, the front lens moves 11.5mm to the left, and the rear lens moves 11.5mm to the right at the same time. After the front and rear lenses return to the origin and overlap, they each move 11.5mm in the opposite direction. m; relative movement zoom ratio: when the front and rear lenses move in opposite directions by 1mm, the diopter changes by 1.00D, i.e. 1.00D / mm; pupil distance: the designed pupil distance is 60mm (±0.25mm), and the diopter change is within 5mm (±0.25mm) to the left and right of the focal length center, within 0.50D (±0.25D); linear zoom area: within the range of 3mm (±0.1mm) above and below the central axis of the inner and outer lenses, the diopter change does not exceed 0.25D (±0.25); non-linear zoom area: outside the range of 3mm (±0.1mm) above and below the central axis of the front and rear lenses, the diopter change exceeds 0.50D (±0.25) and does not exceed 1.00D (±0.25D).

[0075] The left and right cross movement of the front lens 4 and the rear lens 5 results in the diopter of different movement distances on the central axis of the lens, as shown in the following table:

[0076] (Example 2)

[0077] As shown in Figures 7, 8 and 9, the difference from Example 1 is that the auxiliary guiding device in Example 1 is not provided in the installation cavity, and the guide device is not provided with a guide shaft. The guiding device for limiting the movement of the lens provided in the installation cavity includes sliding blocks 30 provided on both side surfaces of the slider body 35, and a guide plate 34 provided on the side of the lower shell 9.

[0078] The lower shell 9 includes a left side plate 31, a middle side plate 33, and a right side plate 32, which are arranged parallel to each other. A cavity is formed between the left side plate 31 and the middle side plate 33, and another cavity is formed between the middle side plate 33 and the right side plate 32. Two screw rods are respectively disposed in the two cavities. Guide plates 34 are provided on the sides of the left side plate 31, the middle side plate 33, and the right side plate 32 relative to the two screw rods. The screw rods are parallel to the guide plates 34.

[0079] The guide plate 34 is arranged at a position corresponding to the sliding block 30; the sliding block 30 and the guide plate 34 constitute a guide device for the movement of the slider, and the sliding block 30 is closely attached to the adjacent guide plate 34 and can slide in the axial direction of the screw rod.

[0080] (Example 3)

[0081] As shown in Figures 10 and 11, the difference between this embodiment and Example 2 is that slots 37 are provided on both the left and right sides of the slider body 35. The slots 37 are gate-shaped slots, with grooves 371 extending deep into the slider body 35 on both sides and an avoidance surface 372 recessed into the slider body 35 in the middle.

[0082] The sliding block 30 includes a connector 301, which is formed as an elastic plate. A boss 302 is fixed to one surface of the connector 301 close to the guide plate 34. The boss 302 is a spherical crown protrusion, and the protrusion surface that slides against the guide plate 34 is a hemispherical surface; the connector 301 is inserted into the slot 37, and the boss 302 is close to the adjacent guide plate 34 and can slide in the axial direction of the screw rod.

[0083] In this embodiment, since the connector 301 is an elastic plate, when the connector 301 is inserted into the slot 37 and the boss 302 is pressed against the adjacent guide plate 34, the connector 301 is elastically deformed and slightly protrudes toward the avoidance surface 372 to ensure that the boss 302 is always in close contact with the adjacent guide plate 34 when the slider assembly moves, thereby avoiding shaking or trembling of the sliding block and the lens.

[0084] (Example 4)

[0085] As shown in Figure 12, the difference between this embodiment and Example 3 is that: roller mounting cavities 38 are provided on the left and right sides of the slider body 35, the sliding block 30 is a roller 39, and the roller 39 is installed in the roller mounting cavity 38 of the slider body 35. The roller 39 is rotatably connected to the slider body 35 in the roller mounting cavity 38, the axis of the roller 39 is perpendicular to the axis of the screw rod, and the rolling surface of the roller 39 is in close contact with the adjacent guide plate 34 and can roll in the axial direction of the screw rod.

[0086] In this embodiment, rollers 18 roll on guide plate 5, reducing wear and tear and increasing service life. Based on the above-described preferred embodiment of the present invention and the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification; its technical scope must be determined according to the scope of the claims.

Claims

1. A pair of continuously variable focus glasses, comprising a body (1), a transmission mechanism, a control module, two left and right temples (2) and a nose pad (3), wherein the temples (2) are hinged to the body (1), the nose pad (3) is mounted in the middle of the body (1), and at least one lens group is mounted on the body (1), each lens group comprises two front lenses and a rear lens which are overlapped and can cross-move, and characterized in that: The lenses are all single-sided free-form continuous zoom lenses, one side of each lens is a plane and the other side is a free-form surface, the free-form continuous zoom lenses are generated using an inner B-spline surface fitting mathematical model, and the surface diopter of the lens continuous zoom channel changes continuously; The control module drives the front lens and the rear lens of the lens group to cross-move at the same speed and in opposite directions through the transmission mechanism to achieve zooming; The body (1) is provided with a shell for installing a transmission mechanism, the shell comprising an upper shell (8) and a lower shell (9), a mounting cavity is formed inside the upper shell (8) and the lower shell (9), a transmission mechanism is provided in the mounting cavity, and the two lenses are both connected to the transmission mechanism in a transmission manner; the transmission mechanism comprises a driving member and a transmission member, the driving member is connected to a driving gear, the transmission member comprises two screw rods, the two screw rods are connected to driven gears, and the driving gears mesh with the driven gears; the two screw rods are provided with sliders threadedly connected thereto, the sliders comprise a slider body (35) and a lens mounting seat (36), the lens mounting seat (36) is fixedly connected to the bottom of the slider body (35), and the two lenses are respectively connected to the two lens mounting seats (36); The threads of the two screw rods are rotated in opposite directions, so that the two sliders move in opposite directions at the same speed under the driving action of the driving member, driving the front lens and the rear lens to move in opposite directions at the same speed; A guide device and / or an auxiliary guide device for limiting the movement of the lens is arranged in the installation cavity. The guide device and / or the auxiliary guide device are arranged parallel to the screw rod, and the guide device and / or the auxiliary guide device are slidably connected to the two sliders.

2. The continuously variable focus glasses according to claim 1, characterized in that: The guide device comprises two guide shafts arranged parallel to the screw rod, and the two guide shafts are respectively slidably connected to the two screw rods.

3. The continuously variable focus glasses according to claim 1, characterized in that: The auxiliary guide device comprises two guide bars arranged in parallel with the screw rod, and the slide block is provided with a slide groove matched with the guide bars, and the slide block is slidably matched with the guide bars.

4. The continuously variable focus glasses according to claim 1, wherein: The lower shell (9) comprises a left side plate (31), a middle side plate (33) and a right side plate (32) which are arranged in sequence and parallel to each other, and two screw rods are respectively arranged in the cavities between the left side plate (31) and the middle side plate (33) and between the middle side plate (33) and the right side plate (32); the guide device comprises sliding blocks (30) arranged on the two side surfaces of the slider body (35), and also comprises guide plates (34) arranged on the left side plate (31), the middle side plate (33) and the right side plate (32); the screw rod is parallel to the guide plate (34); the guide plate (34) is arranged at a position corresponding to the sliding block (30), and the sliding block (30) is closely attached to the adjacent guide plate (34) and can slide in the axial direction of the screw rod.

5. The continuously variable focus glasses according to claim 4, characterized in that: The left and right sides of the slider body (35) are both provided with slots (37), the sliding block (30) comprises a plug-in component (301), the plug-in component (301) is formed as an elastic plate, a boss (302) is fixed on a surface of the plug-in component (301) close to the guide plate (34), the plug-in component (301) is plugged into the slot (37), the boss (302) is closely attached to the adjacent guide plate (34) and can slide in the axial direction of the screw rod; The slot (37) is a gate-shaped slot, with grooves (371) extending deep into the slider body (35) arranged on both sides, and an avoidance surface (372) recessed into the slider body (35) arranged in the middle; the boss (302) is a spherical crown-shaped protrusion, and the protrusion surface that slides against the guide plate (34) is a hemispherical surface.

6. The continuously variable focus glasses according to claim 4, characterized in that: The left and right sides of the slider body (35) are both provided with roller mounting cavities (38), the sliding block (30) is a roller (39), the roller (39) is mounted in the roller mounting cavity (38) of the slider body (35), the roller (39) is rotatably connected with the slider body (35) in the roller mounting cavity (38), the axis of the roller (39) is perpendicular to the axis of the screw rod, the rolling surface of the roller (39) is in close contact with the adjacent guide plate (34) and can roll in the axial direction of the screw rod.

7. The continuously variable focus glasses according to claim 1, characterized in that: A magnet is fixedly connected to the lens, another magnet is installed on the slider, and a mounting groove for mounting magnetic attraction material is provided on the slider of the lens mounting seat (36), and the lens mounting seat (36) is connected to the lens by magnetic attraction.

8. The continuously variable focus glasses according to claim 1, wherein: The body (1) is provided with a control module, the front side of the body (1) is provided with a distance sensor (6), the rear side of the body (1) is provided with a wearing sensor (7), and the body (1) is also provided with a three-axis acceleration sensor. The distance sensor (6), the wearing sensor (7) and the three-axis acceleration sensor are all electrically connected to the control module, and the control module is electrically connected to the driving member to monitor the use status of the continuous zoom glasses and control the transmission mechanism.

9. The continuously variable focus glasses according to claim 1, characterized in that: The lens group comprises two front and rear conjoined lenses for left and right eyes, and the left and right eyes of each conjoined lens have free-form surfaces designed with the same geometric function.

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